Add shared filebacked mmap test

test/apps/mmap/mmap_shared_filebacked.c

@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#define FILE_PATH "test.dat"
+#define FILE_SIZE 4096
+#define CONTENT "shared filebacked mmap test!"
+
+void create_file(const char *path, size_t size)
+{
+	int fd = open(path, O_RDWR | O_CREAT, 0666);
+	if (fd == -1) {
+		perror("open");
+		exit(EXIT_FAILURE);
+	}
+
+	// Ensure the file is of the required size
+	if (ftruncate(fd, size) == -1) {
+		perror("ftruncate");
+		close(fd);
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+void verify_file_contents(const char *path, const char *expected_content)
+{
+	FILE *file = fopen(path, "r");
+	if (file == NULL) {
+		perror("fopen");
+		exit(EXIT_FAILURE);
+	}
+
+	char buffer[FILE_SIZE] = { 0 };
+	fread(buffer, 1, FILE_SIZE, file);
+	fclose(file);
+
+	if (strstr(buffer, expected_content) != NULL) {
+		printf("Content written to the file successfully matches the expected content.\n");
+	} else {
+		printf("Content mismatch! Expected content was not found in the file.\n");
+	}
+}
+
+int main()
+{
+	// Create a file
+	create_file(FILE_PATH, FILE_SIZE);
+
+	// Open the file
+	int fd = open(FILE_PATH, O_RDWR);
+	if (fd == -1) {
+		perror("open");
+		exit(EXIT_FAILURE);
+	}
+
+	// Create a shared mmap
+	char *map = (char *)mmap(NULL, FILE_SIZE, PROT_READ | PROT_WRITE,
+				 MAP_SHARED, fd, 0);
+	if (map == MAP_FAILED) {
+		perror("mmap");
+		close(fd);
+		exit(EXIT_FAILURE);
+	}
+
+	// Write to the memory
+	strcpy(map, CONTENT);
+
+	// Unmap the memory
+	if (munmap(map, FILE_SIZE) == -1) {
+		perror("munmap");
+	}
+
+	// Close file descriptor
+	close(fd);
+
+	// Verify the file contents
+	verify_file_contents(FILE_PATH, CONTENT);
+
+	// Remove the file before exiting
+	if (remove(FILE_PATH) != 0) {
+		perror("remove");
+	} else {
+		printf("Temporary file removed successfully.\n");
+	}
+
+	return 0;
+}

test/apps/scripts/process.sh

@@ -21,6 +21,7 @@ hello_world/hello_world
 itimer/setitimer
 itimer/timer_create
 mmap/mmap_and_fork
+mmap/mmap_shared_filebacked
 pthread/pthread_test
 pty/open_pty
 signal_c/parent_death_signal